/**********************************************************************
项目名称/Project          : 零基础入门学用物联网
程序名称/Program name     : weather_forecast
团队/Team                : 太极创客团队 / Taichi-Maker (www.taichi-maker.com)
作者/Author              : CYNO朔
日期/Date（YYYYMMDD）     : 20200601
程序目的/Purpose          : 
通过心知天气(www.seniverse.com)免费服务获取天气预报信息（三日）。
-----------------------------------------------------------------------
其它说明 / Other Description
心知天气API文档说明: https://www.seniverse.com/docs

本程序为太极创客团队制作的免费视频教程《零基础入门学用物联网 》中一部分。该教程系统的
向您讲述ESP8266的物联网应用相关的软件和硬件知识。以下是该教程目录页：
http://www.taichi-maker.com/homepage/esp8266-nodemcu-iot/                                  
***********************************************************************/
#include <ArduinoJson.h>
#include <ESP8266WiFi.h>

const char* ssid     = "Xiaomi_1A69";       // 连接WiFi名（此处使用taichi-maker为示例）
                                            // 请将您需要连接的WiFi名填入引号中
const char* password = "NEO135802";          // 连接WiFi密码（此处使用12345678为示例）
 
const char* host = "api.seniverse.com";   // 将要连接的服务器地址  
const int httpPort = 80;              // 将要连接的服务器端口      

// 心知天气HTTP请求所需信息
String reqUserKey = "Sxe9ReTZXlQ09GzHm";   // 私钥
String reqLocation = "beijing";            // 城市
String reqUnit = "c";                      // 摄氏/华氏

void setup(){
  Serial.begin(9600);          
  Serial.println("");
  
  // 连接WiFi
  connectWiFi();
}
 
void loop(){
  // 建立心知天气API当前天气请求资源地址
  String reqRes = "/v3/weather/daily.json?key=" + reqUserKey +
                  + "&location=" + reqLocation + "&language=en&unit=" +
                  reqUnit + "&start=0&days=3";

  // 向心知天气服务器服务器请求信息并对信息进行解析
  httpRequest(reqRes);
  
  delay(3000);
}
 
// 向心知天气服务器服务器请求信息并对信息进行解析
void httpRequest(String reqRes){
  WiFiClient client;

  // 建立http请求信息
  String httpRequest = String("GET ") + reqRes + " HTTP/1.1\r\n" + 
                              "Host: " + host + "\r\n" + 
                              "Connection: close\r\n\r\n";
  Serial.println(""); 
  Serial.print("Connecting to "); Serial.print(host);

  // 尝试连接服务器
  if (client.connect(host, 80)){
    Serial.println(" Success!");
 
    // 向服务器发送http请求信息
    client.print(httpRequest);
    Serial.println("Sending request: ");
    Serial.println(httpRequest);  
 
    // 获取并显示服务器响应状态行 
    String status_response = client.readStringUntil('\n');
    Serial.print("status_response: ");
    Serial.println(status_response);
 
    // 使用find跳过HTTP响应头
    if (client.find("\r\n\r\n")) {
      Serial.println("Found Header End. Start Parsing.");
    }
    
    // 利用ArduinoJson库解析心知天气响应信息
    parseInfo(client); 
  }
  else {
    Serial.println(" connection failed!");
  }   
  //断开客户端与服务器连接工作
  client.stop(); 
}

// 连接WiFi
void connectWiFi(){
  WiFi.begin(ssid, password);                  // 启动网络连接
  Serial.print("Connecting to ");              // 串口监视器输出网络连接信息
  Serial.print(ssid); Serial.println(" ...");  // 告知用户NodeMCU正在尝试WiFi连接
  
  int i = 0;                                   // 这一段程序语句用于检查WiFi是否连接成功
  while (WiFi.status() != WL_CONNECTED) {      // WiFi.status()函数的返回值是由NodeMCU的WiFi连接状态所决定的。 
    delay(1000);                               // 如果WiFi连接成功则返回值为WL_CONNECTED                       
    Serial.print(i++); Serial.print(' ');      // 此处通过While循环让NodeMCU每隔一秒钟检查一次WiFi.status()函数返回值
  }                                            // 同时NodeMCU将通过串口监视器输出连接时长读秒。
                                               // 这个读秒是通过变量i每隔一秒自加1来实现的。                                              
  Serial.println("");                          // WiFi连接成功后
  Serial.println("Connection established!");   // NodeMCU将通过串口监视器输出"连接成功"信息。
  Serial.print("IP address:    ");             // 同时还将输出NodeMCU的IP地址。这一功能是通过调用
  Serial.println(WiFi.localIP());              // WiFi.localIP()函数来实现的。该函数的返回值即NodeMCU的IP地址。  
}

// 利用ArduinoJson库解析心知天气响应信息
void parseInfo(WiFiClient client){
  const size_t capacity = JSON_ARRAY_SIZE(1) + JSON_ARRAY_SIZE(3) + JSON_OBJECT_SIZE(1) + JSON_OBJECT_SIZE(3) + JSON_OBJECT_SIZE(6) + 3*JSON_OBJECT_SIZE(14) + 860;
  
  DynamicJsonDocument doc(capacity);
  
  deserializeJson(doc, client);
  
  JsonObject results_0 = doc["results"][0];
  
  JsonArray results_0_daily = results_0["daily"];
  
  JsonObject results_0_daily_0 = results_0_daily[0];
  const char* results_0_daily_0_date = results_0_daily_0["date"]; 
  const char* results_0_daily_0_text_day = results_0_daily_0["text_day"]; 
  const char* results_0_daily_0_code_day = results_0_daily_0["code_day"];
  const char* results_0_daily_0_text_night = results_0_daily_0["text_night"]; 
  const char* results_0_daily_0_code_night = results_0_daily_0["code_night"]; 
  const char* results_0_daily_0_high = results_0_daily_0["high"];
  const char* results_0_daily_0_low = results_0_daily_0["low"]; 
  const char* results_0_daily_0_rainfall = results_0_daily_0["rainfall"];
  const char* results_0_daily_0_precip = results_0_daily_0["precip"]; 
  const char* results_0_daily_0_wind_direction = results_0_daily_0["wind_direction"]; 
  const char* results_0_daily_0_wind_direction_degree = results_0_daily_0["wind_direction_degree"];
  const char* results_0_daily_0_wind_speed = results_0_daily_0["wind_speed"];
  const char* results_0_daily_0_wind_scale = results_0_daily_0["wind_scale"];
  const char* results_0_daily_0_humidity = results_0_daily_0["humidity"];
  
  JsonObject results_0_daily_1 = results_0_daily[1];
  const char* results_0_daily_1_date = results_0_daily_1["date"];
  const char* results_0_daily_1_text_day = results_0_daily_1["text_day"];
  const char* results_0_daily_1_code_day = results_0_daily_1["code_day"];
  const char* results_0_daily_1_text_night = results_0_daily_1["text_night"]; 
  const char* results_0_daily_1_code_night = results_0_daily_1["code_night"]; 
  const char* results_0_daily_1_high = results_0_daily_1["high"];
  const char* results_0_daily_1_low = results_0_daily_1["low"]; 
  const char* results_0_daily_1_rainfall = results_0_daily_1["rainfall"]; 
  const char* results_0_daily_1_precip = results_0_daily_1["precip"]; 
  const char* results_0_daily_1_wind_direction = results_0_daily_1["wind_direction"];
  const char* results_0_daily_1_wind_direction_degree = results_0_daily_1["wind_direction_degree"]; 
  const char* results_0_daily_1_wind_speed = results_0_daily_1["wind_speed"];
  const char* results_0_daily_1_wind_scale = results_0_daily_1["wind_scale"];
  const char* results_0_daily_1_humidity = results_0_daily_1["humidity"]; 
  
  JsonObject results_0_daily_2 = results_0_daily[2];
  const char* results_0_daily_2_date = results_0_daily_2["date"];
  const char* results_0_daily_2_text_day = results_0_daily_2["text_day"];
  const char* results_0_daily_2_code_day = results_0_daily_2["code_day"];
  const char* results_0_daily_2_text_night = results_0_daily_2["text_night"];
  const char* results_0_daily_2_code_night = results_0_daily_2["code_night"];
  const char* results_0_daily_2_high = results_0_daily_2["high"]; 
  const char* results_0_daily_2_low = results_0_daily_2["low"]; 
  const char* results_0_daily_2_rainfall = results_0_daily_2["rainfall"];
  const char* results_0_daily_2_precip = results_0_daily_2["precip"]; 
  const char* results_0_daily_2_wind_direction = results_0_daily_2["wind_direction"]; 
  const char* results_0_daily_2_wind_direction_degree = results_0_daily_2["wind_direction_degree"]; 
  const char* results_0_daily_2_wind_speed = results_0_daily_2["wind_speed"];
  const char* results_0_daily_2_wind_scale = results_0_daily_2["wind_scale"]; 
  const char* results_0_daily_2_humidity = results_0_daily_2["humidity"]; 
  
  const char* results_0_last_update = results_0["last_update"]; 
  
  // 从以上信息中摘选几个通过串口监视器显示
  String results_0_daily_0_date_str = results_0_daily_0["date"].as<String>();
  String  results_0_daily_0_text_day_str = results_0_daily_0["text_day"].as<String>(); 
  int results_0_daily_0_code_day_int = results_0_daily_0["code_day"].as<int>(); 
  String results_0_daily_0_text_night_str = results_0_daily_0["text_night"].as<String>(); 
  int results_0_daily_0_code_night_int = results_0_daily_0["code_night"].as<int>(); 
  int results_0_daily_0_high_int = results_0_daily_0["high"].as<int>();
  int results_0_daily_0_low_int = results_0_daily_0["low"].as<int>();
  String results_0_last_update_str = results_0["last_update"].as<String>();

  Serial.println(F("======Today Weahter ======="));
  Serial.print(F("DATE: "));
  Serial.println(results_0_daily_0_date_str);
  Serial.print(F("Day Weather: "));
  Serial.print(results_0_daily_0_text_day_str);
  Serial.print(F(" "));
  Serial.println(results_0_daily_0_code_day_int);
  Serial.print(F("Night Weather: "));
  Serial.print(results_0_daily_0_text_night_str);
  Serial.print(F(" "));
  Serial.println(results_0_daily_0_code_night_int);
  Serial.print(F("High: "));
  Serial.println(results_0_daily_0_high_int);
  Serial.print(F("LOW: "));
  Serial.println(results_0_daily_0_low_int);
  Serial.print(F("Last Update: "));
  Serial.println(results_0_last_update_str);
  Serial.println(F("=============================="));
}